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Adaptability and dosage of concrete admixture

Release time:

2022-08-10

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Modern people's requirements for the living environment are getting higher and higher, and the corresponding construction industry has begun to introduce more building materials. In order to meet people's heating needs in winter, builders not only installed suitable heating pipes in the process of the project, but also added some high temperature protection grade materials, such as graphite polystyrene board, to the exterior of the residential building. So what are the advantages of the widely used graphite polystyrene board to make it popular with builders?

Adaptability and dosage of concrete admixture

1. Adaptability of concrete admixture cement

Different varieties of water reducing agent on the dispersion of cement, water reducing, increasing effect is different, for the same water reducing agent, different varieties of cement its water reducing effect is also very different. Cement with high C3A content in clinker and cement with high alkali content have poor water reduction effect after adding water reducing agent. Gypsum in cement or industrial waste gypsum as a coagulant will appear abnormal phenomenon, the greater the C3A content, the faster the setting speed, when the C3A content is greater than 8%, the concrete will occur rapid setting phenomenon, which is the adaptability of cement to admixtures.

In order to better use the admixture, the admixture should be selected to do the fluidity test when the cement is used, and the use should be decided according to the test results. Do not rely on subjective inference, otherwise it will lead to serious consequences.

2. The dosage of concrete admixture

Each admixture has a suitable dosage, which depends on the quality of the admixture and the cement and aggregate used. If the dosage is too small, the admixture cannot play its due role and cannot achieve the expected effect; if the dosage is excessive, it will have the opposite effect. Therefore, before use, the appropriate amount should be determined through testing.

Precautions when using concrete admixture

1, the amount of concrete admixture is accurate, in the construction should be based on the design dosage of accurate preparation of admixture. If it is a liquid, the concentration of the liquid should be accurately determined; if it is a powder, it should be evenly and accurately added to control the error within ± 2%.

2, mixing evenly, we must try to make the admixture evenly distributed throughout the mixture, so that it can give full play to its role, to avoid the adverse consequences of local too thick. Powder such as cement together, should be spread, and appropriate to extend the mixing time; liquid agent should also be evenly distributed to prevent concentration together.

3, concrete admixture mixing processing sequence can not be disorderly, for adding several kinds of concrete admixture, should pay attention to the order of adding, some are allowed to be transported to the site before adding.

4, with different seasons should be timely replacement of admixture, different admixture has different characteristics, autumn to winter construction, concrete admixture should be replaced in advance, winter should use antifreeze early strong admixture, ready for winter construction.

5. Designate a person in charge. In order to ensure the quality of the admixture, when using the admixture, one person must be assigned to be responsible for the operation each time. Before these workers are specially trained and the method of carefully handing over the admixture can ensure the accurate dosage.

The use of concrete admixture greatly improves the flow performance of concrete, while reducing the amount of cementitious materials in concrete. Therefore, the application of concrete admixture is very extensive. In the long-term production practice, the author found that there are many admixture use errors in the mixing station, resulting in insufficient concrete strength, poor workability, or high cost of concrete mix ratio.

1. It has good fireproof performance. For buildings, fire prevention has always been a need to pay attention to during construction and use, and the factory quality qualified graphite polystyrene board can pass the professional testing department's building materials combustion performance grade standard, mainly because some special flame retardant materials are added inside the product, so it has very stable fire resistance.

2. It has good heat insulation ability. Compared with other types of polystyrene board, graphite polystyrene board has graphite particles. The specially treated graphite particles have excellent reflection ability to heat radiation, so it can reduce indoor heat loss. In addition, there is a good component inside the graphite polystyrene board to improve the thermal insulation performance, that is, the infrared absorber.

3. It has good moisture resistance. Many residential buildings use materials with poor moisture resistance, so there will be some mold affecting the appearance. In fact, this situation is not only detrimental to the health of residents, but may also damage the structure of buildings in severe cases. The graphite polystyrene board has excellent moisture-proof performance, and rain is not easy to penetrate into the interior of the building when it rains.

Graphite polystyrene board has strong compressive strength, excellent adhesion and freeze-thaw resistance, which determine its excellent characteristics as an external wall insulation material. Graphite polystyrene board also has the characteristics of strong and durable. Even if it is used as an external wall insulation material for a long time, there will be no cracking and hollowing. Therefore, many construction industries like to choose graphite polystyrene board as insulation material.

The construction process of graphite polystyrene board is very simple, the material construction and forming speed is fast, and the overall performance is good. Solve the shortcomings of the traditional insulation board easy to crack, and the corner of the outer wall does not need special treatment. Therefore, the selection of this insulation material can speed up the construction speed of the construction project and reduce the total cost of the project. Because the graphite polystyrene board has many excellent characteristics, it has been widely used. Experts show that with the improvement of manufacturing technology and the gradual strengthening of commodity quality, graphite polystyrene board will have great development prospects in the future.

The above is about some knowledge of graphite polystyrene board, I hope you can seriously learn to understand the relevant knowledge, choose the right products and equipment for their own needs, if you want to know more details, you can contact us.

Key words:

Concrete admixture

What is the main mechanism of action of concrete admixture?

What is the classification of concrete admixture?

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